Phys 313 Quiz 22

Question 1

A long straight wire carries a current into the board. Point P lies nearly above the wire. Which direction is the magnetic field at point P?

   Answer:  to the right

Question 2

A long straight wire carries a current I into the board. There are two circles drawn on the board, both centered on the wire. One has a large radius, the other a small radius.

The integral

             B dot ds

• greater than the integral around the big circle
• the same as the integral around the big circle
• less than the integral around the big circle

   Answer:    b), the same (because both circle surround the same
	                 amount of current)

Question 3

What is the value of the integral

            B dot ds

   Answer:  mu-nought times I

Copyright © Michael Richmond. This work is licensed under a Creative Commons License.